Liquid-measuring device.



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W/TNE88E8; [3/ 2y IIVVENTOR @344 t 32 6%4/46 P3065 BY 2 MEN/5} g Patented 00 12.28, 1913:

onmns 1''. Ross, on SEATTLE, WASHINGTON.

nqmnmvam nnvrca 7 Specification dfiettei's fatentl Patented Oct. 28,1913.

Application fled December 31, 1918. Serill 1T0. 739,545.

To all whom it may concern:

Be it known that I, Cnanmzs P. Ross, a citizen of the United, States, residing at Seattle, in the county of King and State of Washin ton, have invented certain new and useful mprovements in Liquid-Measuring Devices, of which the following is a specification.

This invention relates to liquid measuring pump apparatus, and is in the nature of an improvement on the invention forming the subject matter of my prior application filed in the U. S. Patent Oflice July 13, 1912, Serial No. 709,256.

' The object of my improvements is the PI'OVJSlOIl of a device of this character which willbe of relatively inexpensive construction and eflicient in operation.

The invention consists in the novel construction, adaptation and combination of parts, as will be hereinafter described and claimed.

In the accompanying drawings, Figure l is a vertical section of'a liquid measurer embodying my invention. Fig. 2 is a similar view of a portion of the lower end of thepump cylinder with the plum er-stop shown in a different position from t at in which it is illustrated in Fig. 1; and Fig. 3 is a perspective view of the plunger-stop.

Referring tothe drawings, the numeral 5 designates a portion of a barrel or other suitable liquid container. 6 is a draw-oil tube provided at one end with screw threads for engagement in an outlet formed in the end of said container. At the outer end of said tube is aspout 7 and intermediate its length is an upwardly directed branch 8 making connection with a superposed cylinder 9.

Partitions 10 and 11 are provided, as shown, within the tube between the branch 8 and the ends of the tube. Said partitions are formed with passages and provided therefor are spring closed inlet and outlet valves 12 and 13 which open outwardly with respect to the liquid container. Operable within said cylinder is a packed piston 14 I having a stem 15 which extends through an aperture provided in the cylinder-head 16 and terminates in a handle 17 whereby the piston is operated. The piston stem is characterized by being provided near its upper and lower ends, respectively, with annular recesses 18, and 19 and therebetween the stem is formed with a series of relatively small alternating annular grooves 20 and ridges orteeth 2 22 represents a pawl which is inclosed by acaslng 23 secured to or formed upon the cylinder head 16. Said pawl is fulcrumed intermediate its length to a pivotal pin 2:4.

which is supported by the casing. A helical spring 25 isconnected to an end of the pawl as shown in Fig. 1, and tends to maintain the same in a horizontal position.

When the stem is the piston, the pawl encounters the teeth 21 and is tilted thereby into the position in which it is indicated by broken lines A until the stem enters the recess 19 at the termination of the upward stroke of the piston; whereupon the pawl is-caused by the spring to assume a horizontal position and upon the downward stroke of the piston the teeth 21 will affect the pawl to swing it into do-tted line position B and thus by engaging the successive teeth in each stroke any reverse movement .of the piston is prevented until the pawl enters oneor the other of the recesses.

Supplementary to the above explained appliances for preventing reverse movements of the piston before completing the strokes thereof, I provide a device to positively prevent the operation 'of the piston when the liquid is absent from within the cylinder. To such end, I provide a stop, shown detached in Fig. 3, consisting of a hub- 26 through which extends whereby it is supported'in a recess provided at the lower end of the cylinder. Extending radially from the hub 26 and into cvlinder of a diameter slightly less than said opening. At the opposite side of the pin is a pulled upwardly to raise 1' a pivotal pin '27 opening 28 is a disk shaped blade 29* relatively heavy arm 30, and extending respectively above and below the pin is a post- 31 and a finger 32. When liquid is being ejected from the cylinder through the office of the piston on its down stroke, the liquid will cause the blade 29 to be drawn therewith into the opening until arrested by the finger 32 contacting with the wall of the opening, whereupon the post 31 will be -swung toward the axis of the cylinder and in position to enter the cavity 33 provided within the lower end of the piston stem, as

, gageable with the stem for clearly shown in Fig. 1. When the liquid, however, is replaced b air within the cylinder, the discharge 0 the air will escape without overcoming the power of the arm 30 which will hold the post 31 in the pos tion in which it is represented in Fig. 2, to be encountered by the piston and prevent the latter completing the downward stroke and while the stem teeth are still engaged by the pawl. The piston cannot then be moved upwardly by reason of the-pawl engaging a tooth, nor can it be moved in the opposite direction because of the obstruction due to the post and, consequently, the piston becomes inoperative. tus again operative, it must be tilted rearwardly to correspondingly swing the post from engagement with the piston.

The cylinder 9 is constructed to contain a certain quantity, as a half-pint for example, of liquid. Each time the stem 15 is pulled up to its extreme height that quan tity of the liquid is drawn into the cylinder by the suction created by the piston and when the piston is pushed down the liquid previously drawn into the cylinder is ejected. The valves 12 and 13 being of the nonreturn type, accommodate themselves to such flow of liquid to and from the cylinder. It is to be noted, however, that the piston is inoperative to expel any liquid from the cylinder until the latter is completely filled, but the liquid may be discharged in smaller quantities than the capacity of the cylinder until emptied.

What I claim, is-

1. In apparatus of the class described, a measuring cylinder provided at one end with an inlet and discharge opening, a piston therefor, a stem terminatm in a handle for operating the piston, an means-enreverse movement of the piston before the termination of the successlve strokes.

2. 1n apparatus of the class described, a pump cylinder having an opening at one end for both the admission and discharge of liquid, a valveless piston for the cylinder, means for reciprocating the piston, said means comprising a stem extending through the cylinder head and formed with a plurality of teeth interposed between two recesses, and a pawl engageable with said teeth whereby the piston is prevented from being moved in a revers direction before To render the appara preventing: any pum resented to the the successive the recesses of the stem are pawl at the termination 0 strokes of the piston.

Y 3. In apparatus of the class described, a

measuring cylinder, a piston therefor, a stem for operating the piston, meansengageable with the stem for preventing any reverse movement of the piston before the termination of the successlve strokes, and means cooperating with the aforesaid means tor locking the piston against movement when the supply of liquid to the apparatus is interrupted.

4. In apparatus of the class described, a pump cylinder, a draw-ofi tube connected with the cylinder, non-return valves provided in said tube for re ulating the flow of liquid to and from the cylinder, a piston for thecylinder, a spring-actuated pawl, and an operati stem for the piston, said stem being torme to be engaged by the pawl to prevent reverse movement being imparted to the piston before the termination of the successive strokes.

5. In apparatus of the class described, a pump cylinder, a draw-0E tube connected intermediate its length to said cylinder spring-controlled non-return valves in said tube at opposite sides of its connection with the cylinder, a piston for the cylinder, an operating stem for the piston, said stem being provided in proximity to each of its extremities with a peripheral recess and intermediate the recesses is provided with a series of annular ridges, and a spring-controlled pawl'engageable with the said ridges to prevent an reverse movement of the piston before t e respective recesses are presented to the pawl at the termination of the successive strokes-0f the piston.

; 6. In apparatus of the class described, a p cylinder, a draw-ofi tube connected with the cylinder, non-return valves provided ,in said tube for regulating the flow of liquid to and from the cylinder, a stem for actuating the piston, and means provided within the cylinder for securing the piston against retrograde movement before the termination of its successive strokes.

Signed at Seattle, Wash, this 19th day of December, 1912.

CHARLES P. ROSS. Witnesses:

PIERRE BARNES, E. PETERSON. 

